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Rework bakery lock with WFE/SEV sequence
Current implementation of Bakery Lock does tight-loop waiting upon lock contention. This commit reworks the implementation to use WFE instruction for waiting, and SEV to signal lock availability. It also adds the rationale for choosing Bakery Locks instead of exclusion primitives, and more comments for the lock algorithm. Fixes ARM-software/tf-issue#67 Change-Id: Ie351d3dbb27ec8e64dbc9507c84af07bd385a7df Co-authored-by: Vikram Kanigiri <vikram.kanigiri@arm.com>
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Dan Handley
committed
on 20 Mar 2014
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| include/bakery_lock.h |
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| lib/sync/locks/bakery/bakery_lock.c |
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